Interacoustics Sera - Indication lights on Sera

D-0114042-D – 2020/03
Sera™ - Additional Information Page 22
Automated ABR protocols
The Sera
TM
device is delivered with one default Automated ABR protocol (A00 CE-Chirp 35 dB nHL). The
protocol on the device can be changed and additional protocols can be added to Sera
TM
through the
HearSIM
TM
software.
The available protocols are:
Protocol name
Stimulus type
Stimulus
intensity
Rejection
level
Max test
time
Algorithmic
Sensitivity
A00 CE-Chirp 35 dB nHL
CE-Chirp
®
35 dB nHL
100 µV
3 minutes
> 99.6%
A01 CE-Chirp 30 dB nHL
CE-Chirp
®
30 dB nHL
100 µV
3 minutes
> 99.6%
A02 CE-Chirp 40 dB nHL
CE-Chirp
®
40 dB nHL
100 µV
3 minutes
> 99.6%
A03 CE-Chirp 45 dB nHL
CE-Chirp
®
45 dB nHL
100 µV
3 minutes
> 99.6%
A04 Click 35 dB nHL
Click
35 dB nHL
100 µV
3 minutes
> 99.6%
A05 Click 30 dB nHL
Click
30 dB nHL
100 µV
3 minutes
> 99.6%
A06 Click 40 dB nHL
Click
40 dB nHL
100 µV
3 minutes
> 99.6%
A07 Click 45 dB nHL
Click
45 dB nHL
100 µV
3 minutes
> 99.6%
Explanation of protocol parameters
Stimulus type
Two stimulus types are available on Sera
TM
, a broadband click and a broadband CE-Chirp
®
.
The Click stimulus is a broadband stimulus comprised of many frequencies that has been used in newborn
hearing screening for many years.
The CE-Chirp
®
stimulus is also a broadband stimulus that compensates for travel time in the cochlea. The
CE-Chirp
®
uses the same frequency characteristics as a traditional click, however by sending the lower
frequencies a little earlier and the highest frequencies a little later into the cochlea, all frequencies activate
their corresponding positions on the basilar membrane at the same time. As a result the ABR response of a
CE-Chirp
®
is bigger and is much easier to detect compared to traditional click measurements. Screening with
the CE-Chirp
®
will in general take less time and have a higher chance of reaching a pass in difficult testing
circumstances. More information about the CE-Chirp is available on the Interacoustics website.
Stimulus intensity
The stimulus intensity is the level at which the stimulus is presented to the ear. The levels available are 30,
35, 40 and 45 dB nHL.
Rejection level
The rejection level sets the EEG artifact rejection level that will be used by the preamplifier. When EEG
levels exceed the set rejection level, the test is automatically paused and no data is collected until EEG
levels fall below the rejection level again.
Maximum test time
The max test time is how long the test will continue for if no response can be detected before it
automatically stops testing and displays a REFER result. The test time on Sera
TM
equals the nett time used
for testing. In other words, it does not include time elapsed when measurements are being rejected. For a
test to reach a REFER, 3 minutes of good data must be collected before the test will automatically stop.